67 Pa. Code § 157.42 - Ambient conditions
(a)
Sound. Requirements concerning ambient sound conditions shall
be as follows:
(1) The ambient A-weighted
sound level at the microphone location point shall be measured, in the absence
of motor vehicle noise, emanating from within the clear noise zone, with fast
meter response using a sound level measurement system that conforms to the
provisions of §
157.31 (relating to types of
measurement systems which may be used).
(2) The measured ambient level shall be ten
decibels (A) or more below that level specified in Table 1, which corresponds
to the maximum permissible sound level reading which is applicable at the test
site at the time of testing.
(b)
Wind. The wind velocity
at the test shall be measured at the beginning of each series of noise
measurements and at intervals of 5-15 minutes thereafter until it has been
established that the wind velocity is essentially constant. Once this fact has
been established, wind velocity measurements may be made at intervals of once
every hour. Noise measurements shall only be made if the measured wind velocity
is 12 miles per hour (19.3 kilometers per hour) or less. Gust wind measurements
of up to 20 miles per hour (33.2 kilometers per hour) shall be
allowed.
(c)
Precipitation. Measurements shall be prohibited under any
condition of precipitation, however, measurements may be made with snow on the
ground. The ground surface within the measurement area shall be free of
standing water.
Notes
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